Mobile rock crushing apparatus

ABSTRACT

A vertical, two-stage rock crusher with inter-linked upper and lower movable jaws including a provision for shifting the link position to effect change in the inlet area of the lower jaw and its amplitude of crushing oscillation.

United States Patent Mailliard [451 Apr. 18, 1972 [54] MOBILE ROCK CRUSHING [56] References Cited APP TUS UNITED STATES PATENTS Inventor: P. Lorna Street, Reddmg, 9601 197,643 ll/l877 Lanyon ..241/140 [22] Filed: I) 4, 1969 1,328,806 1/1920 Andersen... ..24l/l56 2,447,303 8/1948 Anderson. ..24l/l55 X 1 pp 879,966 2,631,785 3/1953 Bogie ..241/1ss x Related Us. Application D I I 3,510,073 5/ 1970" Ma1|l1ard ..24l/8l 2 5 N 646,630, 1 16, 1967 p t N Primary Examiner-Granville Y. Custer, .lr. I I 3 635; er 0 une a o Attorney-Fleht, Hohbach, Test, Albritton & Herbert 521 u.s.c1 .;.241/1ss, 241/202 [571 ABSTRACT fl- .3 26 1/06, A vertical, two-stage rock crusher with inter-linked upper and [58] Field of Search .241! 140, 155, 156, 202 lower movable jaws including a provision for shifting the link position to effect change in the inlet area of the lower jaw and its amplitude of crushing oscillation.

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PATENTEDAPR 18 m2 SHEET 10F 6 I I I INVENTOR. Richard I? Mailliard BY 1:

, W W Attorneys PATENTEDAPR 18 I972 v SHEET 2 0F 6 mym N MW w l aw R PATENTEDAPR 18 m2 SHEET 3 BF 6 PATENTEDAPRWQYE I I 3,656,696

SHEET u 0F 6 I INVENTOR- :1 u M 86 a4 8/ Qflma/WM Attorneys PATENTED R 18 I912 4 '3, 656,696

SHEET 5 OF 6 4 INVENTOR.

BY Richard P Mailliard Attorneys PATENTEmPRmma I 3,656,696 SHEET 6 0F 5 BY JMWW ain/W Attorneys MOBILE ROCK CRUSIIING APPARATUS This is a division of my copending application, Ser. No. 646,630, filed June 16, 1967 now U.S. Pat. No. 3,510,073, issued May 5, 1970.

BACKGROUND OF THE INVENTION This invention relates to a rock crusher which is mobile and which can be utilized for crushing rock picked up from the road bed. There are many roads as, for example, county roads in certain areas which have been covered with aggregate or rock in which the top running surface is worn out. In such roads, there are often many large rocks which protrude above the surface. In addition, there is usually a berm along both edges of the road that contains rock which is too large to use on the road. Thus, it is normally necessary to bring in aggregate at a great expense to recover the road. Equipment for crushing the rock which is already on the road by travelling along the road has not been available commercially. There is, therefore, a need for a portable or mobile rock crusher which can be utilized for such purposes.

SUMMARY OF THE INVENTION The rock crushing apparatus consists of a frame and ground engaging wheels carried by the frame. An elevator assembly is mounted on the frame and delivers rock to the screen assembly. The screen assembly sorts the rock into two sizes and supplies the rocks to chutes. The chutes deliver the rock in plural paths to a multi-section rock crusher. The rock crusher crushes the rock and delivers it to the ground underlying the frame as the apparatus is advanced.

In general, it is an object of the present invention to provide a rock crushing apparatus which is readily capable of picking up rock from a surface and delivering it to a rock crusher and returning it to the surface.

Another object of the invention is to provide apparatus of the above character which can readily reduce the rock to the desired size required for the road bed in a single pass through the rock crusher.

Another object of the invention is to provide apparatus of the above character which has a relatively high capacity.

Another object of the invention is to provide a rock crusher of the above character which can be operated by a single man.

Additional objects and features of the invention will appear from the following description in which the preferred embodiments are set forth in detail in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a plan view of a mobile rock crusher incorporating the present invention.

FIG. 2 is a cross-sectional view taken along the line 22 of FIG. 1.

FIG. 3 is an enlarged detail view of the front portion of the rock crusher shown in FIG. 2.

FIG. 4 is a partial front elevational view looking along the line 4-4 of FIG. 3.

FIG. 5 is a cross-sectional view taken along the line 5-5 of FIG. 3.

FIG. 6 is a cross-sectional view taken along the line 6-6 of FIG. 3.

FIG. 7 is a partial top plan view of the rock crusher shown in FIG. 1.

FIG. 8 is a cross-sectional view taken along the line 8--8 of FIG. 7.

FIG. 9 is a cross-sectional view taken along the line 9-9 of FIG. 8.

DESCRIPTION OF PREFERRED EMBODIMENT The mobile rock crushing apparatus consists of a tractor 11 and a trailer 12 which is drawn by the tractor. The tractor 11 is provided with a frame 13 which carries front steerable ground 16. The rear wheels 16 are driven in a suitable manner as, for example, by an electric motor 17 mounted on a speed reducer 18 and driving a differential 19 connected to the rear wheels 16. A drivers station 21 is provided on the frame 13 with the necessary controls for controlling the tractor and operating the rock crushing apparatus.

A rock elevator assembly 26 is carried on the front portion of the tractor 11 and delivers rock which has been picked up by a conveyor assembly 27 also mounted upon the tractor. The conveyor assembly 27 delivers the rock to the trailer 12.

The trailer 12 consists of a frame 31 which is provided with a pair of rear ground engaging wheels 32. The trailer 12 is connected to the tractor 11 by a king pin assembly 33. It will be noted that the king pin assembly 33 generally overlies the rear ground engaging wheels 16 of the tractor 11. A vibratory screen assembly 36 is mounted upon the front portion of the trailer 12 and is adapted to receive the rock as it is discharged from the conveyor 27'. The vibratory screen 36 delivers the rock to a chute assembly 37 which delivers the rock to be crushed to the rock crusher 38 mounted upon the frame 31.

Suitable means is provided for driving the rock crusher and consists of a large diesel engine 41 mounted upon the rear of the trailer 12. The engine 41 drives a speed reducing train 42 connected to a differential 43 which drives shafts 44 which carry sheaves 46 which drive belts 47. The belts 47 drive sheaves 48 mounted upon a shaft 49 for the rock crusher.

Suitable means is provided for generating electrical power for driving the various electrical motors on the mobile rock crusher. Thus, there has been provided a power take-off 51 which drives belts 52. The belts 52 drive a shaft 53 which is connected to an AC generator 54 mounted upon the trailer 12. It also drives a hydraulic pump 56 for supplying hydraulic fluid under pressure.

The elevator assembly 26 consists of a lower section 58 and an upper section 59. The lower section consists of a pair of spaced parallel frame members 61 which are box-like in crosssection as shown in FIG. 5. The upper extremities of the frame members 61 are provided with stud shafts 62 pivotally mounted in bearing assemblies 63 mounted upon vertical posts 64 fixed to the main frame 13 of the tractor 11. The

frame members 61 extend downwardly as shown in FIG. 3 and have their lower extremities supported at points which are just above the surface of the ground by suitable means such as a pair of caster wheels 68 rotatably mounted in forked members 69. The forked members 69 are swivel mounted in brackets 71. The brackets 71 are pivotally mounted upon bolts 72 secured to the frame members 61. Adjustment of the angular relationship between the bracket 71 and the frame members 61 is provided by the bolts 73 extending through slots 74 provided in the bracket 71.

A pair of guide shoes 81 are mounted on the frame members 61 and diverge outwardly in a forward direction. The guide shoes 81 are provided with arms 82 which are pivotally secured by bolts to the lower extremities of the frame members 61 as shown in FIG. 3. Removable reinforcing wear plates 84 are provided on the lower extremities of the guide shoes 81. A bottom plate 86 is secured to and extends between the box-like frame members 61 and has its lowermost extremity extend to the ground so that it serves as a scoop for the elevator assembly.

The upper section 59 of elevator assembly 26 consists of a pair of spaced parallel side frame members 91 which are also box-shaped in cross-section. The side frame members 91 generally overlie the frame members 61 and are pivotally connected thereto by hollow shafts 92 which are mounted in pillow blocks 93 carried by brackets 94 affixed to the frame members 61. A large sprocket 95 is mounted on a shaft 96. The shaft 96 is mounted in bearing assemblies 97 secured to the members 91. The sprocket 95 drives a large endless chain 98. The shaft 96 is driven from an electric motor 99 through a right angle speed reducer 101. The endless chain 98 travels over another large sprocket 102 mounted on a shaft 103 that engaging wheels 14 and rear driven ground engaging wheels is rotatably mounted in blocks 104. The shaft 103 extends be utilized as means for absorbing through slots 106 provided in the side frame members 91 and the blocks 104 and shaft 103 are adjustable longitudinally of the frame members 91 by screws 106 threaded into plates 107 afiixed to the side frame members 91 so that the endless chain 98 can be properly tensioned.

The endless chain 98 is a special type and consists of a plurality of links 108 which are interconnected by pins 109. A plurality of scoop-like members 111 are mounted upon the endless chain 98 and secured thereto by pins 109. As can be seen from the drawings, the scoop-like members 111 are provided with outwardly and forwardly curved portions 11 1a. For each of the scoop-like members 111, there is provided a separable reinforcing plate 112 which is carried by the link to the rear of the link to which the scoop-like member 111 is attached. This plate 112 is provided with reinforcing gussets 113. The reinforcing plate 112 and scoop-like member 111 are mounted on separate links to makeit possible for them to pass through the arcuate paths formed by the sprockets 95 and 102. While travelling between the sprockets, it can be seen that thereinforcing plates 112 back up and immediately follow the scoop-like members 111 to provide support thereto during the time they are elevating rock.

A pair of side guide angle members 116 are mounted on the outer sides of the frame members 61 and extend upwardly from the side guide members 116 to serve as guides for the upper section 59. Means is provided for supporting the upper section 59 in a predetermined position with respect to the lower section 58 and consists of a pair of air operated actuators 117, the lower extremities of which are secured to brackets 118 mounted on the side frame members 61 and the upper extremities of which are secured to brackets 119 carried by posts 121 affixed to the side frame members 91. By operation of the actuators 117, it can be seen that the position of the scoop-like members 111 relative to the bottom plate 86 can be readily adjusted.

Means is provided for lifting the lower extremity of the elevator assembly 26 off the ground so that the mobile rock crusher can be turned around and also to permit the travel of the same on highways and the like. This means consists of a pair of hydraulic actuators 126. One end of each of the actuators 126 is pivotally mounted on a bracket 127 afiixed to the main frame 13 of the tractor and the other end is pivotally connected to the bracket 118 secured to the frame members 61. As will be noted in FIG. 1, the actuators 126 are mounted at an angle so that, in addition to providing means for lifting the lower extremity of the elevator assembly 26, they can also side loading on the elevator assembly during operation of the apparatus.

The conveyor assembly 27 is of conventional type and is adapted to receive the rock to be crushed as it is delivered by the elevator assembly 26. The conveyor assembly 27 consists of an endless belt 131 driven by a roller 132 mounted on a shaft 133. The shaft 133 is rotatably mounted in bearing blocks 134 carried by plates 136. The plates 136 are affixed to inclined frame members 137 affixed to the vertical posts 64 and vertical posts 138 secured to the main frame 13 of the tractor. The shaft 133 is driven by an electric motor 139 through a right angle speed reducer 141. The upper run of the endless belt 131 is supported by a plurality of rollers 142 rotatably mounted on shafts 143 carried by frame members 144 affixed to the frame member 137. As can be seen in FIG. 6, the rollers are positioned so that a concave bed is provided for the upper run of the endless belt 131. A-pair of spaced parallel side guide plates 146 are provided which incline inwardly and downwardly and have their lower extremities overlie the outer margins of the upper run of the endless belt 131 to prevent material from spilling over the sides of the belt as shown in FIG. 6.

The conveyor assembly 27 hereinbefore described delivers the rock to be crushed to a vibratory screen assembly 36. The vibratory screen assembly 36 is of a conventional type such as the type DC Double Deck Vibrating Screen Assembly manufactured by Kolman Manufacturing Co. of Sioux Falls, South Dakota. As shown in the drawings, such a vibrating screen assembly consists of a pair of spaced parallel side frame members 151 which have a pair of spaced parallel superposed vibrating screens 152 and 153 disposed between same. The vibratory screen assembly also includes an eccentric jack shaft 156 which, upon rotation, causes the screens 152 and 153 to vibrate. The shaft 156 is provided with pulleys 157 on opposite ends which are driven by belts 158. The belts 158 are driven by sheaves 159 mounted on a shaft 161. The shaft 161 is driven by an electric motor 162 through a right angle speed reducer 163. The screen assembly separates the large rock entering the screen assembly into two different sizes. For example, the upper screen could separate out all rock which will not pass through 4 by 4 inches openings and the lower screen could separate out all rock which will not pass through 1 by l 5% inch openings.

The material which passes through both screens 152 and 153 of the vibratory screen assembly 36 falls downwardly onto a downwardly inclined chute 166 mounted upon the frame 31 of the trailer 12 below the screen assembly 36. The chute 166 delivers the material to an endless belt 167 which is disposed in a substantially horizontal plane and is driven by a roller-J68. The roller 168 is driven by a motor 169 through a right angle speed reducer 171. The belt 167 is also mounted upon an end roller 172. A plurality of idler rollers 173 are provided which support the upper run of the belt 167.

The rock crusher 38 consists of three sections; a center section 176 and two outer or side sections 177 and 178. The chute assembly 37 consists of a hopper 179 which receives the large rock which will not pass through the large upper screen 152 and delivers it to the center section 176 of the rock crusher. The chute assembly 37 also consists of a double chute 180 (FIG. 1) which receives the intennediate size rock which will not pass through the screen 153 and delivers it to the two side sections 177 and 178.

The rock crusher 38 consists of a crusher base or frame which is formed of a pair of reinforced side walls 182 and 183,

. a front wall 184 and a rear wall 186. It also includes a pair of dividing walls 187 and 188 which separate the center section 176 from the two side sections 177 and 178. An .eccentric shaft 191 is rotatably mounted in roller bearing assemblies 192 carried by pillow blocks 193 mounted upon the side walls 182 and 183 and upon the divider walls 187 and 188. The sheaves 48 serve as fly wheels and are mounted on opposite ends of the shaft 191 and are driven as hereinbefore described.

A pitman assembly is mounted on the eccentric shaft 191 for each of the sections of the crusher. Thus, a pitman assembly 201 is provided for the center section 176 and pitman assemblies 202 and 203 are provided for the side sections 177 and 178. As shown in FIG. 1, the pitman assemblies are rotatably mounted upon the shaft 191 bybearing assemblies 204. Each of the pitman assemblies 201, 202 and 203 is similar in construction with the exception of certain details which are pointed out hereinafter. The pitman assembly 201 is shown in detail in FIG. 8. Each of the pitman assemblies consists of an upper pitman section 206 and a lower pitman section 207. The upper pitman section 206 is directly mounted upon the eccentric shaft 191, whereas the lower pitman section is connected to the upper pitman section by a link 208 which has one end pivotally connected to the lower extremity of the upper pitman section 206 by a pin 209 and is pivotally connected to the upper portion of the lower pitman section 207 byapin 211.

Movement of the lower extremity of the upper pitman section 206 is controlled by a toggle plate 213, one end of which is engaged by an arcuate bearing member 214 mounted on the lower extremity of the upper pitman section 206. The other end of the toggle plate 213 is disposed in a movable slide plate 216 which is slidable horizontally in ways (not shown) in members 217 and 218 mounted upon the rear wall 186 of the crusher base 181. The slide plate 216 is provided with an inclined surface 219 which is adapted to cooperate with an inclined surface 221 provided on a block 222 which is mounted for vertical movement in the members 217 and 218. Means is provided for vertically positioning a block 222 relative to the block 216 and consists of a screw 223 secured to the block 222 and which is adapted to be moved vertically by a hydraulicmotor 224 mounted upon the rear wall 186.

Means is provided for retaining the upper pitrnan section-in engagement with the toggle plate 213 and consists of a tie rod 226 which is pivotally mounted on the pin 209 and which ex-' tends through the rear wall 186 and has a tensioning spring 227 retained thereon by nuts 228. It can be seen that by adjusting the nuts 228, the desired amount of tension can be placed upon the tie rod 226.

Means is provided for adjusting the position of the link 208 and consists of a link 229 pivotally connected by a pin 230 to the link 208 and pivotally connected to a block 231 by pin 232. The block 231 is slidably mounted in a slot 233 in a block 234. The block 234 is slidably mounted in ways (not shown) provided in members 236 aflixed to the rear wall 186. Means is provided for adjusting the horizontal position of the block 234 and consists of a screw 237 which is secured to the block 234 and can be moved horizontally by hydraulic motor 238. Means is provided for shifting the block 231 in a vertical direction and consists of a screw 239 threaded through the block and driven by an actuator motor 240.

The position of the lower extremity of the lower pitrnan section 207 is controlled by a toggle plate 241 which engages a bearing member 242 provided in the lower portion of the lower pitman section 207. The other end of the toggle plate is carried by a block 243 movable horizontally in ways (not shown) in members 244 secured to the rear wall 186. Means is provided for moving the block 243 horizontally and consists of a screw 246 secured to the block and driven by a hydraulic motor 247. Means is provided for retaining the lower pitrnan section in engagement with the toggle plate 241 and consists of a tie rod 248 pivotally connected by a pin 249 to the lower portion of the lower pitrnan section 207. The tie rod 248 extends through the rear wall 186 and is tensioned-by a spring 251 retained on the rod by nuts 252.

The upper pitman section 206 and lower pitman section 207 are provided with removable wear plates 253 and 254,'respectively. Thus, it can be seen that the upper pitrnan section 206 and the lower pitrnan section 207, in conjunction with the wear plates 253 and 254, provide movable or oscillating jaw sections for the rock crusher which are progressively moved toward and away from the stationary or fixed jaw formed by wear plates 256 removably secured to the front wall 184. Cheek or wear plates 257 are provided on the inner surface of the side walls 182 and 183 and cheek or wear plates 258 are also provided on opposite sides of the divider walls 187 and 188.

In the arrangement shown, the center section 176 of the rock crusher can be called the primary section and can have a suitable opening such as 24 by 30 inches, whereas the two side sections 177 and 178 can be considered to be secondary crushers and have smaller openings as, for example, openings of 12 by 4 inches. The smaller dimensions of the inlets of the two side sections can be seen from FIGS. 7 and 9 of the drawings in which the side sections have only approximately one-half the length of the center section and'less than one-half the width of the center section. However, it will be noted that the upper pitrnan sections 206 for the two side sections widen out to the same length as the center pitrnan section commencing approximately one-half the depth of the upper pitrnan section so that the lower extremity of the upper pitrnan section is the same length as the upper pitrnan section for the center section 176. The lower pitrnan sections 207 are all the same length as can be seen from FIG. 9.

Operation and use of the self-propelled mobile rock crushing apparatus may now be briefly described as follows. The apparatus can be driven to the desired location or, if necessary, it

can be transported to the location in which it is desired to work. For example, let it be assumed that it is desired to utilize therock crusher on a road which has already beensupplied with'rock-or that there is natural rock in the roadway which can be utilized for forming the road. When such is the case, prior to utilization of the apparatus, the rock which is to be crushed is shifted into one or more windrows extending along the road by the use of a'blade or other similar equipment. The apparatus'isthen positioned so that it can travel up the road. The hydraulic actuators 126 are operated to lower the elevator assembly so that the caster wheels 68 are testing upon the ground. The caster wheels-68 are then adjusted relative to the frame member 61 so that the guide shoes 81 are also resting upon the ground. The apparatus is then positioned so that the space between the guide shoes 81 is lined up with the windrow of rocks to be crushed.

All of the electric motors are energized from the power supply provided by the generator 54 and the rock crusher is caused to advance at the desired speed. The rock is moved inwardly by the guide shoes 81 as the apparatus is advanced so that the rocks are picked up by the elevator assembly 26. The elevator assembly 26 travels in a counter-clockwise direction as viewed in FIG. 3 and picks up the rock to be crushed and carries the rock upwardly on the bottom plate 86 and deposits the same onto the conveyor assembly 27.

It has been found that the elevator assembly 26 has a number of advantages in that it can assimilate rocks of various sizes without damaging the elevator assembly. For example, if a particularly large rock enters the elevator assembly, the lower extremity of the upper section 59 can be lifted upwardly by use of the air operated actuators 117 so that it will clear the rock. The rock can then be removed and the upper section 59 lowered to permit it to float on the lower section 58. lfdesired, the upper section 59' can be positioned by use of the actuators 117 to provide any desired spacing between the scoop-like members 1 11 and the bottom plate As hereinbefore described, the entire elevator assembly 26 is pivoted on the shaft 62 so that in the event the elevator assembly strikes a rock which is lodged in the ground, the entire lower portion of the conveyor assembly including the frame members 61 can be lifted upwardly to clear the rock. Thus, it can be seen that the lower section of the elevator assembly is mounted for pivotal movement and that the upper section is mounted for pivotal movement with respect to the lower section to permit the advantageous operation hereinbefore described. I

The endless chain with the scoop-like members 111 are constructed in such a manner that they can handle relatively large rocks without danger of damage to the elevator assembly. In the event one of the scoop-like members strikes a rock, the entire upper section 59 of the elevator assembly will be lifted until the scoop-like member clears the rock and to thereafter permit the rock to be engaged by the following scoop-like member and elevated onto the conveyor assembly 27.

' The conveyor assembly 27 operates in a conventional manner to deliver the rock to the vibratory screen assembly. The elevator assembly 26 and the conveyor assembly 27 have been mounted upon the tractor 11 to facilitate turning of the apparatus and also to limit the total height to which the apparatus must be built to pemiit rock to be delivered to the vibratory screen assembly. However, it can be appreciated that, if desired, the elevator assembly could be constructed so that it could deliver rock directly to the vibratory screen assembly.

The vibratory screen assembly separates the smaller material as, for example, all rocks and material which can pass through a screen ranging from 2 inches down to and including three-fourths inch, and permits the same to fall upon the chute 166 which delivers it onto the belt 167 which carries the material rearwardly and drops the same upon the road bed. The larger material which will not pass through the vibratory screen assembly is delivered to the chute 172 and is delivered to the rock crusher 38. As hereinbefore described, the larger rock is delivered to the center section 176 of the rock crusher,

can be discharged downwardly directly 7 whereas the intennediate size rock is delivered to the side sections 177 and 178.

Upon operation of the rock crushing apparatus, the movable or-oscillating jaws move toward and away from the fixed jaws to'cause the rock to be crushed. As the rock is crushed, it moved downwardly through the rock crusher and is crushed stillfurther. As hereinbefore explained, the oscillating jaws are provided in two, or upper and lower, sections which makes it-possible to achieve-a relatively fine rock.from even very large rock by one pass through the rock crusher. The size of the discharge opening between the upper movable jaw and the.

fixed jaw is adjusted by movement of the'toggle plate 213 by operation of the hydraulic motor 224. Similarly, the discharge "opening'between the lower movable jaw'and the fixed jaw of position of the toggle plate the rock crusher is adjusted by the 241 by operation of the motor 247.

I The size of the inlet between the lower movable jaw and the fixed jaw is determined by the position of the lower portion of the'upper jaw'and by the position of thelink 229 as determined by'motor238.

The amount of oscillatory movement which is imparted to the lower pitman or movable jaw section bythe upper pitman section is controlled by. the vertical position of the link 229 as determined by the motor 240. As the block 231 is raised, the movement which is imparted to the lower pitman section 207 by movement of the upper pitman section 206 is increased. Conversely, when the opposite movement of the link 231 occurs, the oscillatory movement of the upper portion of the lower pitman section 207 or jaw towards the fixed jaw is decreased.

Thus, it can be seen that by controlling the positions of the toggle plates 213 and 241, it is possible to control the sizes of the discharge openings of the upper and lower portions of each of the crusher sections so that material of the desired size issupplied to the road bed. The amount of crushing action which is accomplished by the lower section can be adjusted by adjusting-the vertical position of the link 231.

With the foregoing rock crushing apparatus, it can be seen that'rock of relatively largev sizes can be delivered tothe rock crusher and can be crushed to a relatively fine size so that they to the road bed in the desired size with only a single pass through the rock crusher. By providing the two side sections to receive the smaller rock,

- the capacity of the rock crusher is greatly increased while still delivering rock'of the same size from each of the sections. By

' use of the foregoing apparatus, it can be seen that rock which is on the site can be crushed and placed into use without the necessity of loading the rock and-moving the same to a rock crusher and then returning the road bed. Also, by

with the rock to deliver the same to I the use of such apparatus; it is possible to greatly reduce the costof providing crushed rock for the road bed. The machine is constructed in such a manner that it can be operated by one man to greatly reduce the labor requirements for providing crushed rock for the surfaces of roads. Since the apparatusis mobile, it can be readily moved from one location to another without the loss of any substantial time. The apparatus is such in which the size of the rock which is discharged from the rock crusher can be adjusted automatically by the operator by controlling the hydraulic motors 224,238, 240 and247 for each of the sections of the rock nected to said first l crusher.

I claim: v l. In a rock crusher,- a crusher base having an upper crusher 1 stage with a variable area outlet above an inletof a' lower crusher stage,

a fixed crusher jaw in said crusherstages mounted on said crusher base, an eccentric shafl rotatably mounted on said crusher base, upper and lower movable jaws said fixed cnisher jaw, means arranged in opposed relation to connectingsaid eccentric shaft to said upper movable jaw, t'ustlink means pivotally interconnecting said upper and lower jaws, drive means cooperative with said eccentric shaft serving to impart oscillatory movements to said movable jaws with respect to said fixe d jaw, second link means pivotally conmeans,

pivotally connected to said second link means, means for shifting'said abutment means along a path in opposite directions for increasing and decreasing the'amplitude of oscillation of said movement of said lower movable jaw, second movable abutment means connected to said first movable abutment means, and means for shifting said second abutment means along a path in opposite directions for increasing and decreasing the inlet area of said lower crusher stage.

2. The rock crusher as claim 1 wherein the paths of movement of said first and second abutment means are angularly disposed.

, 3. The rock crusher as in claim 1 and including first power means mounted on said first abutment means serving to shift.

said first movable abutment means and second power means mounted on said crusher base servingrto shift said second abutment means in a direction generally perpendicular to path of movement of said first abutment means.

4. The rock crusher as in claim 1 having three laterally spaced crusher stages in which the center stage has an inlet opening of a substantially larger area than the inlet opening of the side stages, and wherein said eccentricshaft is common to all of said stages.

. 11: l t t first movable abutment means 

1. In a rock crusher, a crusher base having an upper crusher stage with a variable area outlet arranged above an inlet of a lower crusher stage, a fixed crusher jaw in said crusher stages mounted on said crusher base, an eccentric shaft rotatably mounted on said crusher base, upper and lower movable jaws arranged in opposed relation to said fixed crusher jaw, means connecting said eccentric shaft to said upper movable jaw, first link means pivotally interconnecting said upper and lower jaws, drive means cooperative with said eccentric shaft serving to impart oscillatory movements to said movable jaws with respect to said fixed jaw, second link means pivotally connected to said first link means, first movable abutment means pivotally connected to said second link means, means for shifting said abutment means along a path in opposite directions for increasing and decreasing the amplitude of oscillation of said movement of said lower movable jaw, second movable abutment means connected to said first movable abutment means, and means for shifting said second abutment means along a path in opposite directions for increasing and decreasing the inlet area of said lower crusher stage.
 2. The rock crusher as in claim 1 wherein the paths of movement of said first and second abutment means are angularly disposed.
 3. The rock crusher as in claim 1 and including first power means mounted on said first abutment means serving to shift said first movable abutment means and second power means mounted on said crusher base serving to shift said second abutment means in a direction generally perpendicular to path of movement of said first abutment means.
 4. The rock crusher as in claim 1 having three laterally spaced crusher stages in which the center stage has an inlet opening of a substantially larger area than the inlet opening of the side stages, and wherein said eccentric shaft is common to all of said stages. 